Exercise device



FIG. 1 is a front isometric view of an exercise device showing the new design;

FIG. 2 is a rear isometric view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right-side view thereof; and,

FIG. 5 is a top view thereof. 

CLAIM The ornamental design for an exercise device, as shown and described. 